Magneto ignition apparatus



Nov. 20, 1934. w. wALTHER 1,981,638

I MAGNET() IGNITION, APPARATUS Filed-Aug. a, 1931 Patented Nov. 2.0, 1934 UNITED STATES PATENT OFFICE MAGNETO IGNITION APPARATUS Wilhelm Walther, Stuttgart, Germany, assigner to Robert Bosch Aktiengesellschaft, Stuttgart,

Germany 7 Claims.

The present invention relates to magneto ignitionapparatus more especially for single-cylinder motors. In known constructions the end of the high tension Winding is led inside the armature `shaft to the high voltage terminal of the ignition cable and the cam of the contact breaker is formed by a ring mounted on the bearing cover, on the inner periphery of which slides the contact breaker lever rotating with the armature. Ac-

cording to the present invention the bearing cover is itself formed as a cam path for the ro tary circuit breaker lever connected with the armature.

'Two forms of' construction of the invention are l5 shown by Way of example in the accompanying drawing in whichz- Figure 1 is a sectional view through a magneto ignition apparatus having no means for adjusting the point of ignition.

Figure 2 is a sectional View of a construction in which the ignition point can be adjusted.

Figure 3 is an elevation of a detail of the second form of construction.

Figure 4 is a cross-sectional View taken on the line 4-4 of Figure l. v

In the magneto shown in Figure 1, a permanent horseshoe magnet engages in the usual manner over the pole shoes cast in the casing b between which pole shoes the armature c with the primary and secondary windings d rotates. The casing b at the contact breaker vend has a cover e, the hub of which f forms on the one hand a bearing for the armature c, and on the other hand on its circumference the cam path g for the contact breaking lever h. On the armature a plate i is fastened which has a projection k formed as a hollow shaft. This hollow shaft is covered internally by a bush m of insulating material in which a metal pin n is vled which on the one side is connected with one end of the high voltage windingof the armature and on the other side with a carbon brush o. The carbon brush is pressed by a spring pagainst a metal strip r inserted in the casing of the high tension terminal q. The circuit breaker lever his mounted on a pin s1 fastened in the armature plate i and therefore rotates with the armature.

y In Figure 2 b is again the armature casing, c

the armature, d the primary and secondary indings, and e the cover, the hub t of which forms the bearing for the armature hollow shaft k and also a bearing u for an adjustable camy sleeve 1J. The rotating circuit breaker lever h, the plate i of the armature, and the high voltage cable are arranged as in the nrst construction` The cam v is adjusted by means of a pin w which is fastened on a flange of the cam and projects out through a slit y of the cover e and is connected with a closing cap z. This cap is rotatably mounted on a projection or shoulder 1 of the 60 cover and can be adjusted by the lever 2 fastened to it. The high voltage terminal q is screwed on to the cap.

I declare that what I claim is:

l. A magneto ignition apparatus comprising a 05 casing, a field magnet, an armature having primary and secondary windings thereon, an armature shaft having a bore formed therein for accommodation of a conductor leading from the secondary winding, a contact breaker rotatable 7. with the armature and an end cover for said casing having a cam surface formed thereon for operating said contact breaker. l

2. A magneto ignition apparatus comprising a casing, a field magnet, an armature having pri- 76 mary and secondary windings thereon, an armature shaft having a bore formed therein for accommodation of a conductor leading from the secondary winding, a contact breaker rotatable with the armature and an end cover for said 80 casing having an apertured boss adapted to serve as a bearing for the armature shaft and having a cam surface formed externally on said boss for operating the contact breaker.

3. Magneto ignition apparatus comprising a casing, a eld magnet, an armature having primary and secondary windings thereon, an armature shaft having a bore formed therein for accommodation of a conductor leading from the secondary Winding, a contact breaker rotatable with the armature, an end cover on the casing having an inwardly extending boss and a cam ring rotatably mounted on said boss.

4. Magneto ignition apparatus comprising a casing, a field magnet, an armature having primary and secondary windings thereon, an armature shaft having a bore formed therein for accommodation of a conductor leading from the secondary winding, a contact breaker rotatable with the armature, an end cover havingA an apertured boss adapted to serve as a bearing for the armature shaft and a cam fing rotatably mount ed on said boss.

5. Magneto ignition apparatus comprising a casing, a field magnet, an armature having primary and secondary windings thereon, an armature yshaft having a bore formed therein for accommodation of a conductor leading from the secondary winding, a contact breaker rotatable external cam surface formed thereon for actuation of the contact breaker.

7. In a magneto including a casing, armature and contact breaker rotatable with the armature, the provision of an end cover member for the casing adjacent the contact breaker having an inwardly extending boss and a cam ring mounted on said boss for actuation of the contact breaker,-

said contact breaker lying on the outside of a cam ring.

, WILHELM WALTHER. 

